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UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[btn setTitle:@"send" forState:UIControlStateNormal];
[btn setBackgroundImage:[UIImage imageNamed:@"send"] forState:UIControlStateNormal];
[btn addTarget:self action:@selector(sendAction) forControlEvents:UIControlEventTouchUpInside];
btn.frame = CGRectMake(10,20,40.30);
[toolBar addSubview:btn];
这样就行了啊